Lifting-jack



W. E. LOMBARD.

LIFTING JACK. APPLICATION FILED APR. 1, 1921.

1,396,858. 1 Patented Nov. 15,1921.

3 SHEETS-SHEET I.

' 1" .1. 12 12 w i g 0 26 O I o .Q 7 MO k 0 Q liwenior W. E. LOMBARD.

urrme JACK. APPLICATION FILED APR. 1. 1921.

1,396,858. Patented Nov. 15, 1921.

3 SHEETS-SHEET 2- W. E. LOMBARD.

LIFTING JACK.

APPLICATKON FILED APR. lll92l. 1,396,858; PatentedNov. 15, 1921.

' 3 SHEETSSHEET 3- 12 a.

UNITED sT r s P a ENr OFFICE.

WALTER E. LOMBABD, .QF ARLINGTON, MASSAQHUSETTS.

LIF TING-JACK.

e To all whom z'tmay concern:

Beit known that I, WALTER EQLoMBARD,

a citizenof the United States of America,

and a resident of Arlington, in the county of Middlesex and State ofMassachusetts,

have inventedcertain new and useful Improvements in Lifting-Jacks, ofwhichthe following is a specification.

This mventionrelatesto lifting jacks and particularly screw jacks whichare adapted to lower under the weight of the load.

For the purpose The primary object of the presentinvention is theprovision of means whereby the speed of lowering may be controlled byhydraulic means. i i

The invention consists in certain novel features of construction andarrangement of parts which will be understood readily by reference tothe description of the drawings and to theclaims to be hereinaftergiven. l

of illustrating the invention, one preferred form thereof is illustratedin the drawings, this form havingbeen found to give satlsfactoryandfreliable results although it is tobe understood that the variousinstrumentalities of which the invention consists can be variouslyarranged and organized and the invention is not hmited to the precisearrangement and organidescribed and shownexcept as required by the scopeof the appended claims.

Of the drawings; 1 Figure 1 represents an elevation of a 11fting ackembodying the principles of the present invention.

. ings.

.Fig. 2 represents a vertical section of the same. e l e Fig. 3represents a partial plan of same, a portion thereof being shown insection, and

Fig. 4 t represents an enlarged vertical sectionon line 4, 4, on Fig.3.

Similar characters ind cate like parts throughout the several figures ofthe draw- In the drawings. 10 is a base having an upwardly projectingthreaded extension 11 on which is mounted a casing 12 havinglaterallyprojecting rectangular flanges 13 and 14 preferably opposite to eachother and surrounding openings 13f and 14 giving access-to the inter orof said casing i In a depression 315111 the extens onlll is disposed abearin plate 16 having an an- I nulargroove in t e upper face thereofln"Specification of Letters Patent. Patented Nd 1921 Application filedApril 1,

1921. Serial No. 457,758.

which is positioned a pluralityof anti-frio tlon members 17, the upperportions of which extend into an annular groove ina plate 18 surroundingthe hub of a bevel gear 19.

The plate 18 is provided with an apron 20 surrounding the anti-frictionmembers 17 and the lower end of which is closely ad acent the upper faceof the plate 16 thereby preventing dust and other foreign substancesfrom coming into contact with the anti-friction members 17.

Centrally disposed in the base 10 is the s uared member 21, thefiatiside faces of w ich coacting with the walls of the openmg in thebase of which said member is fitted, prevent said member from rotatingabout its axis. a i

This member 21 is provided with a cylindrical extension 22 projectingupwardly through the plate 16 and terminating in a reduced cylindricalportion 23 fitted to the bore of the lifting screw 24.

This lifting screw 24 is provided at' its upper end with a flanged head25 disposed in a recess in theupper end ofthecylindrical load-supportingmember 26.

. Thismember26 is secured to the head 25 by means of screws 27.

The load-lifting member. 26 is provided with a tubular extension 28extending downwardly and surrounding the barrel 29 having ing throughthe flange thereof! into the base 10.

Meshing with the gear 19 is a bevel pinion 33 having a cylindrical shank34 revoluble,

in a bearing 35 in the plate 36 closing the rectangular flanged opening13.

Keyed tothe shank 34 of the gear 33 is a spur gear .37 meshing with apinion 38on the operating shaft 39 extending through a bearing 40 in theplate 36.

The outer end-of the shaft 39has mounted thereon, an operatingmechanism41 which may be of any well-knownconstruction provided withmeans for disconnecting it from the shaft 39 when it is desired to lowerthe load. i

ItIisobvious that when the pinion 38 is rotated by means of theoperating mechatubular extension 28 may be adjusted verti callyrelatively to-the screw 24 when no load is being supported thereby.

'The upper endof the casing 12 is cylindrical and has a bearing face 43which serves as'a guide for the extension 28 as it is reciprocatedvertically.

The lowerend of this extension 28 is also provided with 'a bearingsurface 44 which fits the periphery of the barrel 29."

It is obvious therefore that during the lifting of the load theload-lifting member 26 is guided by the bearing surface 43 at the upperend of the casting 12 and by the bearing, surface 44 on the periphery ofthe barrel 29 while the cylindrical portion'23 extending upwardly intothe bore of the screw 24 servesas' anwadditional guide.

T opefationf I I jliVhen the load'is supported'by. the mem- By thismeans a very rigid support is given to the load-lifting member inwhatever position it may be'durmg the l fting ber '26 it'will beprevented from rotating by means of the weight thereon and consequentlywhen the'nutBO is rotated the screw 24 will be compelled to moveupwardly.

The flange 14 has secured thereto a closing plate 45 having'a bearing 46in its lower end in which is mountedthe shank 47 'ofa pinion 48' meshingwiththe bevel gear 19.

The plate45 also has mounted therein a revoluble shaft 49 having a worm'50 thereon meshing with a'worm gear 51 secured to a. shank 52. on apinion 53 meshing with a gea'r54 having pivoted thereto, pawls engagingafratchet 56 secured tothe shank 47 "of the bevel pinion 48.

By means ofthis construction the gear 48 is free to turn about its axis,in one di-,

rection, during the lifting. operation without transmitting movementtothe worm and the intermediate gears 51, 53 and 54.

. lVhen, however, the load is being lowered under its weight, thedownward movement of thescrew 24"will. rotate the worm 30 in theoppositedirection,'this rotary movement being transmitted through the gears 19and 50 thereby? fi lii f d; rm shaft'49 to be rotated. 1 l

'The closing plate'45 has formed thereon a chambered extension 57 havinga cylindrical chamber 58in which is'mounted an eccentric 59securedtothe' end of the worm shaft 49.

The chamber 58 is closed by the plate 60 secured to the casing 57by'bolts 61.

The shaft 49 is in axial alinement with the center of the chamber 58 andsurrounding the eccentric 59 is an annular piston 62 the periphery ofwhich is continually in contact with the inner wall of the chamber 58 atsome point during the rotation of the shaft 49.

The casing 57 has mounted therein an oscillating, cylindrical, slottedmember 63 in the slot 64 of which reciprocates the radial blade orextension 65 formed upon the annular piston 62.

This radial blade or extension 65 has a fluid passage 66 extendingtherethrough and communicating at its outer end with one end of achamber 67, the opposite end of which communicates with a valve chamber68.

In the valve chamber 68 is a cylindrical bushing 69 in which the valve70 is mounted, said bushing being provided with a plurality of portsadapted to register with ports in the valve 7 O.

The valve 70 is provided with a port 71 communicating with the chamber67 and a port 72 communicating with the chamber 58.

It also has a port 73 communicating with a passage 74 partiallysurrounding the cylindrical chamber 58, said passage 74 having a reversebend at 75 and terminating near the valve 70 at 76.

The casing 57 has upwardly projecting cars 77 provided with hearings inwhich is mounted the revoluble shaft 78 having an operating head 79secured to one end thereof and a. washer 80 at the other end thereof,this washer 80 with the head 79 preventing end movement of said shaft78.

Between the ears 77 the shaft 78 is provided with a helical thread 81 onwhich is adapted to be reciprocated a nut 82 having trunnions '83extending into slots 84 formed in the end of an arm 85 secured to thereduced end 86 of the valve 70.

It is obvious that by rotating the operating head 59, the nut 82 will bemoved endwise of the screw 81 causing the arm 85 to be oscillated aboutits pivot thereby effecting the oscillation of'the valve 70 about itsaxis i .7

to close the ports 71 and 72 or open them to any desired degree.

When the member 26 has been raised to the desired point. the valve 70 isclosed and the lifting mechanism is disengaged from the shaft 39.

' As the interior of the chambers 58-67 and passage 74- are completelyfilled with liquid, it is obvious that the eccentric will be proventedfrom rotation about the axis of the shaft 49 as long as the valve 70remains closed and consequently the load will be retained in elevatedposition.

During the lowering of the load the shaft 49 is rotated in the directionof the arrow (z asaegaes on Fig. 4 and as soon as the valve 70 is openedthe liquid in the chamber 58 in ad Vance of the piston 62 will be freeto pass through the passage 66, chamber 67 and valve '70 to the chamber58 on the opposite Consequently the setting of the valve 70 will providea very effective means for controlling the downward movement of themember 26 under its load so that any predetermined speed may beattained.

The passage 74 may be dispensed with if desired but preferably thispassage is provided to take careof any surplus liquid in case the port72 should become closed be fore the closing of the port 71 in which casea portion of the liquid in advance of the piston 62 will be forced intothe passage 72 under more or less compression.

.As soon as the port. 72 is again opened a portion of the liquid in thepassage 7 4 will be free to pass through the valve and its port 72 intothe chamber 58.

It is selfevident that the port 73 to the passage, is open at all timeswithout regardto the position of the valve 70. Bymeans ofthis inventionthere is provided a hydraulic control. for lifting jacks which ispositive in operation and which mav bequickly set to permit the loweringof the loadat any desired speed.

It is believed that the operation and many advantages of the inventionwill be understood without further description.

Having thus described my invention, claim:

a 1. In a lifting jack, a base; a post secured thereto and extendingupwardly therefrom;

a member revoluble thereon; a nut in the upper end of said revolublemember; a screw in said nut; a weight-supporting head secured to theupper end of said screw; means for guiding said supporting headin itsvertical movement; andmeans for rotating said revoluble member. s

2. Ina lifting jack, a base; a post secured thereto and extendingupwardly therefrom;

a member revoluble thereon; a nut in the upperend of said revolublemember; a screw in Bald nuthavlng a cylindrical bore into which extendsthe upper end of said post;

a weight-supporting head secured to the upper end of said screw; meansfor guiding said supporting head in its vertical movement; and meansforrotating said revoluble member. y

3. In alifting jack, a base; a post secured thereto and extendingupwardly therefrom;

amember revoluble thereon; a nut in the upper end of said revolublemember; a screw in said nut; a weight-supportnig head secured to theupper end ofsaid screw; means for guiding said supporting head in itsvertical movement; a bevel gear on the lower end of said revolublemember; two pinions meshing therewith; a lifting mechanism adapted toactuate one of said pinions; and a brake mechanism adapted to beactuated by the other pinion.

4. In a lifting ack a base; a post secured thereto and extendingupwardly therefrom; a member revoluble thereon; a nut in the upper endof said revoluble member; a screw in said nut; a weight-supporting headsccured to the upper end of said s::rew; means for guiding saidsupporting head in its vertical movemen.t;a bevel gear on the lower endof said revoluble member; two pinions meshing therewith anddiametrically opposed to each other; a lifting mechanism adapted toactuate one of said pinions; and a brake mechanism adapted to beactuated by the other pinion.

5. In a lifting jack, a base a postextending upwardly therefrom; atubular member revolubly mounted thereon; a nut screwed in the upper endthereof; a screw extending through said nut into said tubular member; aweight-supporting head secured to the upper end of said screw; means forguiding said supporting head in its vertical movement; and means forrotating said revoluble member.

6. In a lifting jack, a base; a post extending upwardly therefrom; atubular member .revolubly mounted thereon; a nut secured her; aweight-supporting head secured to the upper end of said screw andprovided with a downwardly extending cylindrical portion the lower endof which is fitted to said tu' bularmember; means for guiding saidsupporting head in its vertical movement; and means for rotatingsaidrevoluble member.

7. In a lifting jack, a base; a post ex tending upwardly therefrom; atubular member revolubly mounted thereon; a nut secured in the upper endthereof; a screw extendingthrough said nut into said tubular member; aweight-supporting head secured to the upper end of said screw; a casingprovided with a cylindrical bearing surface for guiding the upper end ofsaid supporting head in its vertical movement; and means for rotatingsaid revoluble member.

8. In a lifting; jack, a base; a postextending upwardly therefrom; atubular mem ber revolubly mounted thereon; a nut secured in the upperend thereof; a screw extending through said nut into said tubularmember; a weight-supporting head secured to the upper end of said screwand provided with a downwardly extending cylindrical portion the lowerend of which is fitted to said tubular member; a casing provided with acylindrical bearing surface for guiding the upper end of said supportinghead in its vertical movement; and means for rotating said revolublemember.

In a lifting jack, a base; a post extending upwardly therefrom; atubular member revolubly mounted on said post; a nut in the upper endthereof; a screw extending through said nut intosaid tubular member; aweight-supporting head secured to the upper end of said screw; a casinghaving at its upper end a bearing for said head; a gear secured to thelower end of said tubular member; means for rotating said gear; anannular grooved plate surrounding the hub of said gear; an annulargrooved plate superimposed on said base; and anti-friction membersinterposed between and positioned in the grooves ofsaid plates.

10. In a lifting jack, a base; apost extending upwardly therefrom; atubular member revolubly mounted on said post; anut in the upperendthereof; a screw extending through said nut into said tubular member; aweight-supporting head secured to the upper end of said screw; a'casinghaving at its upper end a bearing for said head; a gear secured to thelower end of said tubular member; means for rotating said gear; anannular grooved plate surrounding the hub of said gear; an annulargrooved plate superimposed on said base; anti-friction membersinterposed between and positioned in the grooves of said plates; and anannular band secured to the periphery of one plate and extending intocontact with the other plate.

11. In. a lifting jack a weight-supporting member; means-forrais'ingsaid weight-supporting member; a shaft adapted to be rotatedonly during the lowering of the load; an. eccentric secured thereto andrevoluble therewith; a casing having a cylindrical chamber concentric tosaid shaft in which said eccentric is adapted to rotate; a piston ringon said eccentric contacting with the cylihdrical wall of said chamber;a radial blade extending from said piston member and having a passagetherethrough; an oscillating member having a slot through which saidblade extends; and a valve adapt- Y ed to close a-passage in said casingfrom the outer end of said blade to said chamber.

12. In a lifting jack, a'weight-supporting member; means for raisingsaid weight-supporting member; a shaft adapted to be rotated only duringthe lowering of the load;

(an eccentric secured thereto and. revoluble therewith; a casing havinga cylindrical chamber concentric to said shaft in which said eccentricis adapted to rotate; a piston ring on said eccentric contacting withthe cylindrical wall of said chamber; a radial blade extending from saidpiston member and having a passage therethrough; an oseillating memberhaving a slot through which said blade extends; and an oscillating valveadapted to close a passage in said casing from the outer end of saidblade to said chamber.

13. In a lifting jack, :1 weight-supporting member; means for raisingsaid weight-supporting member; a shaft adapted to be rotated only duringthe lowering of the load; an eccentric secured thereto and revolublctherewith; a casing having a cylindricad chamber concentric to saidshaft in which said eccentric is adapted to rotate; a piston ring onsaid eccentric contacting with the cylindrical wall of said chamber; aradial blade extending from said piston member and having a passagetherethrough; an oscillating member having a slot through which saidblade extends; and a valve adapted to close a passage in said casingfrom the outer end of said blade to said chamber on the closed side ofsaid blade.

14. In a lifting jack, a weight-supporting member; means for raisingsaid weight-supporting member; a shaft adapted to be rotated only duringthe lowering of the load; an eccentric secured thereto and revolubletherewith; a casing having a cylindrical chamber concentric to saidshaft in which said eccentric is adapted to rotate; a piston ring onsaid eccentric contacting with the cylindrical wall of said chamber; aradial blade extending from said piston member and having a passagetherethrough; an oscillating member having a slot through which saidblade extends; a cylindrical valve adapted to close a passage in saidcasing from the outer end of said blade to said chamber; an arm on saidvalve; and means coac'ting with said arm for moving said valve about itsaxis.

15. In a lifting jack a weight-supporting member; means for raising saidweightsupporting member; a shaft adapted to be rotated only during thelowering of the load; an eccentric secured thereto and revolubletherewith; a casing having a cylindrical chamber concentric to saidshaft in which said eccentric is adapted to rotate; a piston ring onsaid eccentric contacting with the cylindrical wall of said chamber; aradial blade extending from said piston member and having a passagetherethrough; an oscillating member having a slot through which saidblade extends; a valve adapted to close a passage in said casing fromthe outer end of said blade to said chamber; an arm on said valve; arevoluble screw; a nut threaded to said screw and movable endwisethereon during the rotation thereof; and a connection between said nutand arm causing the oscillation of said valve during the reciprocationof said nut.

i supporting member; a shaft adapted to berotated only duringtlielowering of the load; and a hydraulic mechanism coacting with the end ofsaid shaft for preventing the rotation of said shaft when desired andcontrolling its speed of rotation when permittedto revolve. a i

a 117. In a lifting jack, a weight-supporting member; means for raisingsaid weightssupporting member; a shaft adapted to be rotated only duringthe lowering of the load;

an eccentric on said shaft rotatable in a closed chamber; and hydraulicmeans for controllin the rotation of said eccentric in said cham or. a a

18. In a lifting jack, a weightsupporting member; means for raising saldweight-supand means for regulating the passage of the liquid from thechamber on one side of said blade to the other side of said chamber.

19. In a lifting jack, a weight-supporting member; means for raisingsaid weight-supporting member; a shaft adapted to be rotated only duringthe lowering of the load; an eccentric on said shaft rotatable in aclosed chamber adapted to be filled with liquid; an annular piston onsaid eccentric contacting with the cylindrical wall of said chamber andprovided with a radial blade having a passage therein communicatingwithsaid chamber on one side of said blade; and means for regulating thepassage of the liquid from the chamber on one side of said blade to theother side of said chamber.

20. In a lifting jack, a weight-supporting member; means for raisingsaid weight-supporting member; ashaft adapted to be rotated only duringthe lowering of the. load; a casing having a cylindrical chamber adaptedto be filled with liquid; a bladed member in said chamber adapted to beactuated by the rotation of said shaft and adapted to prevent the directcirculation ofliquid in said chamber from one side of saidblade to theother side thereof; and means for controlling the fiow of liquid in anindirect passage around said blade.

21. In a liftin jack, a weight-supporting member; means or raising saidweight-supporting member; a shaft adapted to be rotated only during thelowering of the load; a casing having a cylindrical chamber concentricwith said shaft and partially surrounded by a connecting assagecommunicating therewith at one end by two communicating passages, saidchamber and connecting passage both containing fluid; an eccentricpiston secured to said shaft within said chamber and provided with aradial blade having a fluid passage therein communicating with saidchamber; an oscillating member in one communicating passage providedwith a diametrical slot through which said bladeextends; and a valve inthe other communicatingpassage adapted to control the fluid between saidchamber and connecting passage. l. l l a 22. In a lifting jack, aweight-supporting member; means for raising said weight-supportingmember; a shaft adapted to be rotatedonly during thelowering of theload; a casing having a cylindrical chamber concentric with said shaftand partially surrounded by a connecting passage communicating therewithat one end by two communicating passages, said chamber and connectingpassage both containing fluid, an eccentric piston secured to said shaftwithin said chamber and provided with a radial blade having a fluidpassage therein communicating with said chamber; an oscillating memberin one communicating passage provided with a diametrical slot throughwhich said blade extends; and an oscillating valve in the othercommunicating passage adapted to control the fluid between said chamberand connecting passage.

23. In a liftin jack, a weight-supporting member; means %or raising saidweight-supporting member; a shaft adapted to be rotated only during thelowering of the load; a casing havinga cylindricalchamber concentricwith said shaft and partially surrounded by a connecting passagecommunicating therewith at one end by two communicating passages, saidchamber and connecting passage both containing fluid; an eccentricpiston secured to said shaft within said chamber and provided with aradial blade having a fluid passage therein communicating with saidchamber; an oscillating member in one communicating passage providedwith a diametrical slot through which said blade extends; and a valve inthe other communicating passage adapted to control the fluid betweensaid chamber and connecting passage; said valve having a portcommunicating with the fluid passage in said radial blade and anotherport communicating with said chamber.

24. In a lifting jack, a weight-supporting member; means for raisingsaid weight-supporting member; a shaft adapted to be rotated only duringthe lowering of the load; a casing having a cylindrical chamberconcentric with said shaft and partially surrounded by a connectingpassage communicating therewith at one end by two communicatingpassages, said chamber and connecting passages both containing fluid; aneccentric piston secured to said shaft within said chamber and providedwith a radial blade ing with said chamber; an oscillating member in onecommunicating passage provided with a diametrical slot through whichsaid blade extends; a valve in the other communicating passage adaptedtocontrol the fluid between said chamber and connecting passage; and meansfor adjusting said valve about its arms. a

25. In a lifting ack, a weight-supporting member; means for raising saidweight-supporting member; a shaft adapted to be rotated only during thelowering of the load; a casing having a cylindrical chamber concentricwith said shaft and partially surrounded by a connecting passagecommunicating therewith at one end by two communieating passages, saidchamber and connecting passage both containing fluid; an eccentricpiston secured to said shaft within said chamber and provided with aradial blade having a fluid passage therein communicating wlth saidchamber; an oscillating member in one communicating passage providedwith a diametrical slot through which said blade extends; a valve in theother communicating passage adapted to control the fluid between saidchamber and connecting passage; and means for adjusting said valve aboutits axis and locking it in adjusted position.

In testimony whereof I have signed my name to this specification atBoston, Mass, this 31st day of March, 1921.

WALTER E. LOMBARD.

